The only repair is replacement, Here is the step by step process to remove and replace the seat recliner per the service manual.
NOTE: Notice the routing of the recliner cable for installation.
WARNING: Do not pull on upper recliner handle or recliner cable end. The recliner lead screw is spring loaded and will eject if either the handle or cable is pulled before the lead screw is removed.
Separate the recliner from the seat back.
Let me know if you need further help.